Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 1 | /* |
| 2 | * gpiolib support for Wolfson Arizona class devices |
| 3 | * |
| 4 | * Copyright 2012 Wolfson Microelectronics PLC. |
| 5 | * |
| 6 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or modify it |
| 9 | * under the terms of the GNU General Public License as published by the |
| 10 | * Free Software Foundation; either version 2 of the License, or (at your |
| 11 | * option) any later version. |
| 12 | * |
| 13 | */ |
| 14 | |
| 15 | #include <linux/kernel.h> |
| 16 | #include <linux/slab.h> |
| 17 | #include <linux/module.h> |
| 18 | #include <linux/gpio.h> |
| 19 | #include <linux/platform_device.h> |
| 20 | #include <linux/seq_file.h> |
| 21 | |
| 22 | #include <linux/mfd/arizona/core.h> |
| 23 | #include <linux/mfd/arizona/pdata.h> |
| 24 | #include <linux/mfd/arizona/registers.h> |
| 25 | |
| 26 | struct arizona_gpio { |
| 27 | struct arizona *arizona; |
| 28 | struct gpio_chip gpio_chip; |
| 29 | }; |
| 30 | |
| 31 | static inline struct arizona_gpio *to_arizona_gpio(struct gpio_chip *chip) |
| 32 | { |
| 33 | return container_of(chip, struct arizona_gpio, gpio_chip); |
| 34 | } |
| 35 | |
| 36 | static int arizona_gpio_direction_in(struct gpio_chip *chip, unsigned offset) |
| 37 | { |
| 38 | struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip); |
| 39 | struct arizona *arizona = arizona_gpio->arizona; |
| 40 | |
| 41 | return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, |
| 42 | ARIZONA_GPN_DIR, ARIZONA_GPN_DIR); |
| 43 | } |
| 44 | |
| 45 | static int arizona_gpio_get(struct gpio_chip *chip, unsigned offset) |
| 46 | { |
| 47 | struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip); |
| 48 | struct arizona *arizona = arizona_gpio->arizona; |
| 49 | unsigned int val; |
| 50 | int ret; |
| 51 | |
| 52 | ret = regmap_read(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, &val); |
| 53 | if (ret < 0) |
| 54 | return ret; |
| 55 | |
| 56 | if (val & ARIZONA_GPN_LVL) |
| 57 | return 1; |
| 58 | else |
| 59 | return 0; |
| 60 | } |
| 61 | |
| 62 | static int arizona_gpio_direction_out(struct gpio_chip *chip, |
| 63 | unsigned offset, int value) |
| 64 | { |
| 65 | struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip); |
| 66 | struct arizona *arizona = arizona_gpio->arizona; |
| 67 | |
| 68 | if (value) |
| 69 | value = ARIZONA_GPN_LVL; |
| 70 | |
| 71 | return regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, |
| 72 | ARIZONA_GPN_DIR | ARIZONA_GPN_LVL, value); |
| 73 | } |
| 74 | |
| 75 | static void arizona_gpio_set(struct gpio_chip *chip, unsigned offset, int value) |
| 76 | { |
| 77 | struct arizona_gpio *arizona_gpio = to_arizona_gpio(chip); |
| 78 | struct arizona *arizona = arizona_gpio->arizona; |
| 79 | |
| 80 | if (value) |
| 81 | value = ARIZONA_GPN_LVL; |
| 82 | |
| 83 | regmap_update_bits(arizona->regmap, ARIZONA_GPIO1_CTRL + offset, |
| 84 | ARIZONA_GPN_LVL, value); |
| 85 | } |
| 86 | |
| 87 | static struct gpio_chip template_chip = { |
| 88 | .label = "arizona", |
| 89 | .owner = THIS_MODULE, |
| 90 | .direction_input = arizona_gpio_direction_in, |
| 91 | .get = arizona_gpio_get, |
| 92 | .direction_output = arizona_gpio_direction_out, |
| 93 | .set = arizona_gpio_set, |
| 94 | .can_sleep = 1, |
| 95 | }; |
| 96 | |
Bill Pemberton | 3836309 | 2012-11-19 13:22:34 -0500 | [diff] [blame] | 97 | static int arizona_gpio_probe(struct platform_device *pdev) |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 98 | { |
| 99 | struct arizona *arizona = dev_get_drvdata(pdev->dev.parent); |
| 100 | struct arizona_pdata *pdata = arizona->dev->platform_data; |
| 101 | struct arizona_gpio *arizona_gpio; |
| 102 | int ret; |
| 103 | |
| 104 | arizona_gpio = devm_kzalloc(&pdev->dev, sizeof(*arizona_gpio), |
| 105 | GFP_KERNEL); |
| 106 | if (arizona_gpio == NULL) |
| 107 | return -ENOMEM; |
| 108 | |
| 109 | arizona_gpio->arizona = arizona; |
| 110 | arizona_gpio->gpio_chip = template_chip; |
| 111 | arizona_gpio->gpio_chip.dev = &pdev->dev; |
| 112 | |
| 113 | switch (arizona->type) { |
| 114 | case WM5102: |
| 115 | case WM5110: |
| 116 | arizona_gpio->gpio_chip.ngpio = 5; |
| 117 | break; |
| 118 | default: |
| 119 | dev_err(&pdev->dev, "Unknown chip variant %d\n", |
| 120 | arizona->type); |
| 121 | return -EINVAL; |
| 122 | } |
| 123 | |
| 124 | if (pdata && pdata->gpio_base) |
| 125 | arizona_gpio->gpio_chip.base = pdata->gpio_base; |
| 126 | else |
| 127 | arizona_gpio->gpio_chip.base = -1; |
| 128 | |
| 129 | ret = gpiochip_add(&arizona_gpio->gpio_chip); |
| 130 | if (ret < 0) { |
| 131 | dev_err(&pdev->dev, "Could not register gpiochip, %d\n", |
| 132 | ret); |
| 133 | goto err; |
| 134 | } |
| 135 | |
| 136 | platform_set_drvdata(pdev, arizona_gpio); |
| 137 | |
| 138 | return ret; |
| 139 | |
| 140 | err: |
| 141 | return ret; |
| 142 | } |
| 143 | |
Bill Pemberton | 206210c | 2012-11-19 13:25:50 -0500 | [diff] [blame^] | 144 | static int arizona_gpio_remove(struct platform_device *pdev) |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 145 | { |
| 146 | struct arizona_gpio *arizona_gpio = platform_get_drvdata(pdev); |
| 147 | |
| 148 | return gpiochip_remove(&arizona_gpio->gpio_chip); |
| 149 | } |
| 150 | |
| 151 | static struct platform_driver arizona_gpio_driver = { |
| 152 | .driver.name = "arizona-gpio", |
| 153 | .driver.owner = THIS_MODULE, |
| 154 | .probe = arizona_gpio_probe, |
Bill Pemberton | 8283c4f | 2012-11-19 13:20:08 -0500 | [diff] [blame] | 155 | .remove = arizona_gpio_remove, |
Mark Brown | 31ba56f | 2012-06-23 13:29:25 +0100 | [diff] [blame] | 156 | }; |
| 157 | |
| 158 | module_platform_driver(arizona_gpio_driver); |
| 159 | |
| 160 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); |
| 161 | MODULE_DESCRIPTION("GPIO interface for Arizona devices"); |
| 162 | MODULE_LICENSE("GPL"); |
| 163 | MODULE_ALIAS("platform:arizona-gpio"); |